1 /* BFD back-end for Zilog Z800n COFF binaries.
2 Copyright (C) 1992-2021 Free Software Foundation, Inc.
3 Contributed by Cygnus Support.
4 Written by Steve Chamberlain, <sac@cygnus.com>.
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
22
23 #include "sysdep.h"
24 #include "bfd.h"
25 #include "libbfd.h"
26 #include "bfdlink.h"
27 #include "coff/z8k.h"
28 #include "coff/internal.h"
29 #include "libcoff.h"
30
31 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER (1)
32
33 static reloc_howto_type r_imm32 =
34 HOWTO (R_IMM32, 0, 2, 32, false, 0,
35 complain_overflow_bitfield, 0, "r_imm32", true, 0xffffffff,
36 0xffffffff, false);
37
38 static reloc_howto_type r_imm4l =
39 HOWTO (R_IMM4L, 0, 0, 4, false, 0,
40 complain_overflow_bitfield, 0, "r_imm4l", true, 0xf, 0xf, false);
41
42 static reloc_howto_type r_da =
43 HOWTO (R_IMM16, 0, 1, 16, false, 0,
44 complain_overflow_bitfield, 0, "r_da", true, 0x0000ffff, 0x0000ffff,
45 false);
46
47 static reloc_howto_type r_imm8 =
48 HOWTO (R_IMM8, 0, 0, 8, false, 0,
49 complain_overflow_bitfield, 0, "r_imm8", true, 0x000000ff, 0x000000ff,
50 false);
51
52 static reloc_howto_type r_rel16 =
53 HOWTO (R_REL16, 0, 1, 16, false, 0,
54 complain_overflow_bitfield, 0, "r_rel16", true, 0x0000ffff, 0x0000ffff,
55 true);
56
57 static reloc_howto_type r_jr =
58 HOWTO (R_JR, 1, 0, 8, true, 0, complain_overflow_signed, 0,
59 "r_jr", true, 0xff, 0xff, true);
60
61 static reloc_howto_type r_disp7 =
62 HOWTO (R_DISP7, 0, 0, 7, true, 0, complain_overflow_bitfield, 0,
63 "r_disp7", true, 0x7f, 0x7f, true);
64
65 static reloc_howto_type r_callr =
66 HOWTO (R_CALLR, 1, 1, 12, true, 0, complain_overflow_signed, 0,
67 "r_callr", true, 0xfff, 0xfff, true);
68
69 #define BADMAG(x) Z8KBADMAG(x)
70 #define Z8K 1 /* Customize coffcode.h. */
71 #define __A_MAGIC_SET__
72
73 /* Code to swap in the reloc. */
74 #define SWAP_IN_RELOC_OFFSET H_GET_32
75 #define SWAP_OUT_RELOC_OFFSET H_PUT_32
76 #define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
77 dst->r_stuff[0] = 'S'; \
78 dst->r_stuff[1] = 'C';
79
80 /* Code to turn a r_type into a howto ptr, uses the above howto table. */
81
82 static void
rtype2howto(arelent * internal,struct internal_reloc * dst)83 rtype2howto (arelent *internal, struct internal_reloc *dst)
84 {
85 switch (dst->r_type)
86 {
87 default:
88 internal->howto = NULL;
89 break;
90 case R_IMM8:
91 internal->howto = &r_imm8;
92 break;
93 case R_IMM16:
94 internal->howto = &r_da;
95 break;
96 case R_JR:
97 internal->howto = &r_jr;
98 break;
99 case R_DISP7:
100 internal->howto = &r_disp7;
101 break;
102 case R_CALLR:
103 internal->howto = &r_callr;
104 break;
105 case R_REL16:
106 internal->howto = &r_rel16;
107 break;
108 case R_IMM32:
109 internal->howto = &r_imm32;
110 break;
111 case R_IMM4L:
112 internal->howto = &r_imm4l;
113 break;
114 }
115 }
116
117 #define RTYPE2HOWTO(internal, relocentry) rtype2howto (internal, relocentry)
118
119 static reloc_howto_type *
coff_z8k_reloc_type_lookup(bfd * abfd ATTRIBUTE_UNUSED,bfd_reloc_code_real_type code)120 coff_z8k_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
121 bfd_reloc_code_real_type code)
122 {
123 switch (code)
124 {
125 case BFD_RELOC_8: return & r_imm8;
126 case BFD_RELOC_16: return & r_da;
127 case BFD_RELOC_32: return & r_imm32;
128 case BFD_RELOC_8_PCREL: return & r_jr;
129 case BFD_RELOC_16_PCREL: return & r_rel16;
130 case BFD_RELOC_Z8K_DISP7: return & r_disp7;
131 case BFD_RELOC_Z8K_CALLR: return & r_callr;
132 case BFD_RELOC_Z8K_IMM4L: return & r_imm4l;
133 default: BFD_FAIL ();
134 return 0;
135 }
136 }
137
138 static reloc_howto_type *
coff_z8k_reloc_name_lookup(bfd * abfd ATTRIBUTE_UNUSED,const char * r_name)139 coff_z8k_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
140 const char *r_name)
141 {
142 if (strcasecmp (r_imm8.name, r_name) == 0)
143 return &r_imm8;
144 if (strcasecmp (r_da.name, r_name) == 0)
145 return &r_da;
146 if (strcasecmp (r_imm32.name, r_name) == 0)
147 return &r_imm32;
148 if (strcasecmp (r_jr.name, r_name) == 0)
149 return &r_jr;
150 if (strcasecmp (r_rel16.name, r_name) == 0)
151 return &r_rel16;
152 if (strcasecmp (r_disp7.name, r_name) == 0)
153 return &r_disp7;
154 if (strcasecmp (r_callr.name, r_name) == 0)
155 return &r_callr;
156 if (strcasecmp (r_imm4l.name, r_name) == 0)
157 return &r_imm4l;
158
159 return NULL;
160 }
161
162 /* Perform any necessary magic to the addend in a reloc entry. */
163
164 #define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
165 cache_ptr->addend = ext_reloc.r_offset;
166
167 #define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
168 reloc_processing(relent, reloc, symbols, abfd, section)
169
170 static void
reloc_processing(arelent * relent,struct internal_reloc * reloc,asymbol ** symbols,bfd * abfd,asection * section)171 reloc_processing (arelent *relent,
172 struct internal_reloc *reloc,
173 asymbol **symbols,
174 bfd *abfd,
175 asection *section)
176 {
177 relent->address = reloc->r_vaddr;
178 rtype2howto (relent, reloc);
179
180 if (reloc->r_symndx > 0)
181 relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
182 else
183 relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
184
185 relent->addend = reloc->r_offset;
186 relent->address -= section->vma;
187 }
188
189 static void
extra_case(bfd * in_abfd,struct bfd_link_info * link_info,struct bfd_link_order * link_order,arelent * reloc,bfd_byte * data,unsigned int * src_ptr,unsigned int * dst_ptr)190 extra_case (bfd *in_abfd,
191 struct bfd_link_info *link_info,
192 struct bfd_link_order *link_order,
193 arelent *reloc,
194 bfd_byte *data,
195 unsigned int *src_ptr,
196 unsigned int *dst_ptr)
197 {
198 asection * input_section = link_order->u.indirect.section;
199
200 switch (reloc->howto->type)
201 {
202 case R_IMM8:
203 bfd_put_8 (in_abfd,
204 bfd_coff_reloc16_get_value (reloc, link_info, input_section),
205 data + *dst_ptr);
206 (*dst_ptr) += 1;
207 (*src_ptr) += 1;
208 break;
209
210 case R_IMM32:
211 /* If no flags are set, assume immediate value. */
212 if (! (*reloc->sym_ptr_ptr)->section->flags)
213 {
214 bfd_put_32 (in_abfd,
215 bfd_coff_reloc16_get_value (reloc, link_info,
216 input_section),
217 data + *dst_ptr);
218 }
219 else
220 {
221 bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
222 input_section);
223 /* Addresses are 23 bit, and the layout of those in a 32-bit
224 value is as follows:
225 1AAAAAAA xxxxxxxx AAAAAAAA AAAAAAAA
226 (A - address bits, x - ignore). */
227 dst = (dst & 0xffff) | ((dst & 0xff0000) << 8) | 0x80000000;
228 bfd_put_32 (in_abfd, dst, data + *dst_ptr);
229 }
230 (*dst_ptr) += 4;
231 (*src_ptr) += 4;
232 break;
233
234 case R_IMM4L:
235 bfd_put_8 (in_abfd,
236 ((bfd_get_8 (in_abfd, data + *dst_ptr) & 0xf0)
237 | (0x0f
238 & bfd_coff_reloc16_get_value (reloc, link_info,
239 input_section))),
240 data + *dst_ptr);
241 (*dst_ptr) += 1;
242 (*src_ptr) += 1;
243 break;
244
245 case R_IMM16:
246 bfd_put_16 (in_abfd,
247 bfd_coff_reloc16_get_value (reloc, link_info, input_section),
248 data + *dst_ptr);
249 (*dst_ptr) += 2;
250 (*src_ptr) += 2;
251 break;
252
253 case R_JR:
254 {
255 bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
256 input_section);
257 bfd_vma dot = (*dst_ptr
258 + input_section->output_offset
259 + input_section->output_section->vma);
260 int gap = dst - dot - 1; /* -1, since we're in the odd byte of the
261 word and the pc's been incremented. */
262
263 if (gap & 1)
264 abort ();
265 gap /= 2;
266 if (gap > 127 || gap < -128)
267 (*link_info->callbacks->reloc_overflow)
268 (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
269 reloc->howto->name, reloc->addend, input_section->owner,
270 input_section, reloc->address);
271
272 bfd_put_8 (in_abfd, gap, data + *dst_ptr);
273 (*dst_ptr)++;
274 (*src_ptr)++;
275 break;
276 }
277
278 case R_DISP7:
279 {
280 bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
281 input_section);
282 bfd_vma dot = (*dst_ptr
283 + input_section->output_offset
284 + input_section->output_section->vma);
285 int gap = dst - dot - 1; /* -1, since we're in the odd byte of the
286 word and the pc's been incremented. */
287
288 if (gap & 1)
289 abort ();
290 gap /= 2;
291
292 if (gap > 0 || gap < -127)
293 (*link_info->callbacks->reloc_overflow)
294 (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
295 reloc->howto->name, reloc->addend, input_section->owner,
296 input_section, reloc->address);
297
298 bfd_put_8 (in_abfd,
299 (bfd_get_8 ( in_abfd, data + *dst_ptr) & 0x80) + (-gap & 0x7f),
300 data + *dst_ptr);
301 (*dst_ptr)++;
302 (*src_ptr)++;
303 break;
304 }
305
306 case R_CALLR:
307 {
308 bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
309 input_section);
310 bfd_vma dot = (*dst_ptr
311 + input_section->output_offset
312 + input_section->output_section->vma);
313 int gap = dst - dot - 2;
314
315 if (gap & 1)
316 abort ();
317 if (gap > 4096 || gap < -4095)
318 (*link_info->callbacks->reloc_overflow)
319 (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
320 reloc->howto->name, reloc->addend, input_section->owner,
321 input_section, reloc->address);
322
323 gap /= 2;
324 bfd_put_16 (in_abfd,
325 (bfd_get_16 ( in_abfd, data + *dst_ptr) & 0xf000) | (-gap & 0x0fff),
326 data + *dst_ptr);
327 (*dst_ptr) += 2;
328 (*src_ptr) += 2;
329 break;
330 }
331
332 case R_REL16:
333 {
334 bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
335 input_section);
336 bfd_vma dot = (*dst_ptr
337 + input_section->output_offset
338 + input_section->output_section->vma);
339 int gap = dst - dot - 2;
340
341 if (gap > 32767 || gap < -32768)
342 (*link_info->callbacks->reloc_overflow)
343 (link_info, NULL, bfd_asymbol_name (*reloc->sym_ptr_ptr),
344 reloc->howto->name, reloc->addend, input_section->owner,
345 input_section, reloc->address);
346
347 bfd_put_16 (in_abfd, (bfd_vma) gap, data + *dst_ptr);
348 (*dst_ptr) += 2;
349 (*src_ptr) += 2;
350 break;
351 }
352
353 default:
354 abort ();
355 }
356 }
357
358 #define coff_reloc16_extra_cases extra_case
359 #define coff_bfd_reloc_type_lookup coff_z8k_reloc_type_lookup
360 #define coff_bfd_reloc_name_lookup coff_z8k_reloc_name_lookup
361
362 #ifndef bfd_pe_print_pdata
363 #define bfd_pe_print_pdata NULL
364 #endif
365
366 #include "coffcode.h"
367
368 #undef coff_bfd_get_relocated_section_contents
369 #define coff_bfd_get_relocated_section_contents \
370 bfd_coff_reloc16_get_relocated_section_contents
371
372 #undef coff_bfd_relax_section
373 #define coff_bfd_relax_section bfd_coff_reloc16_relax_section
374
375 CREATE_BIG_COFF_TARGET_VEC (z8k_coff_vec, "coff-z8k", 0, 0, '_', NULL, COFF_SWAP_TABLE)
376